Performed annual heating maintenance Orangevale. 4 year ruud split system attic. Tested system, operational at this time. Tested blower capacitor 20@19.8. Cleaned burners and flame sensor. Checked inducer motor ok. Visually inspected electrical, all connections tight and ok. Control board ok, may be getting hot spots took pictures of board to compare over time. Thermostat wire into unit has spare wires, so if you ever want to upgrade to a different thermostat we can. Spark ignitor ok. Tested system safety features working at this time. Ducts are a mix of grey and silver flex ducts. It’s weird they sealed the new return duct, but did not seal the older grey one to the plenum. Filters 2 disposable, 14-30-1 and 14-25-1. Ready to be changed. Might want to look into upgrading filtration. To an electrostatic filter. Things to look at in the summer. The ac secondary drain pan has had water in it at some point, we will keep an eye on it during next visit.